staging: emxx_udc: Fix unsigned int to bare use of unsigned

This is a patch to fixes up a
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
found by the checkpatch.pl tool

Signed-off-by: Anchal Jain <anchalj109@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>